| Flutter macOS Embedder |

Instance Methods | List of all members
FlutterKeyboardManager Class Reference

`#import <FlutterKeyboardManager.h>`

Inheritance diagram for FlutterKeyboardManager:

## Instance Methods
(nonnull instancetype) | - initWithViewDelegate:
(void) | - handleEvent:
(BOOL) | - isDispatchingKeyEvent:
(void) | - syncModifiersIfNeeded:timestamp:
(nonnull NSDictionary *) | - getPressedState

## Detailed Description

Processes keyboard events and cooperate with |TextInputPlugin|.

A keyboard event goes through a few sections, each can choose to handled the event, and only unhandled events can move to the next section:

- Pre-filtering: Events during IME are sent to the system immediately.
- Keyboard: Dispatch to the embedder responder and the channel responder simultaneously. After both responders have responded (asynchronously), the event is considered handled if either responder handles.
- Text input: Events are sent to |TextInputPlugin| and are handled synchronously.
- Next responder: Events are sent to the next responder as specified by |viewDelegate|.

Definition at line 24 of file FlutterKeyboardManager.h.

## Method Documentation

## ◆ getPressedState

- (nonnull NSDictionary *) getPressedState |  |  |

Returns the keyboard pressed state.

Returns the keyboard pressed state. The dictionary contains one entry per pressed keys, mapping from the logical key to the physical key.

Definition at line 357 of file FlutterKeyboardManager.mm.

357 {
358 // The embedder responder is the first element in _primaryResponders.
359 FlutterEmbedderKeyResponder* embedderResponder =
360 (FlutterEmbedderKeyResponder*)_primaryResponders[0];
361 return [embedderResponder getPressedState];
362 }

References FlutterEmbedderKeyResponder::getPressedState.

## ◆ handleEvent:

- (void) handleEvent: |  | (nonnull NSEvent*) | event |

Processes a key event.

Unhandled events will be dispatched to the text input system, and possibly the next responder afterwards.

Definition at line 179 of file FlutterKeyboardManager.mm.

179 :(nonnull NSEvent*)event {
180 // The `handleEvent` does not process the event immediately, but instead put
181 // events into a queue. Events are processed one by one by `processNextEvent`.
182
183 // Be sure to add a handling method in propagateKeyEvent when allowing more
184 // event types here.
185 if (event.type != NSEventTypeKeyDown && event.type != NSEventTypeKeyUp &&
186 event.type != NSEventTypeFlagsChanged) {
187 return;
188 }
189
190 [_pendingEvents addObject:event];
191 [self processNextEvent];
192 }

## ◆ initWithViewDelegate:

- (nonnull instancetype) initWithViewDelegate: |  | (nonnull id<FlutterKeyboardViewDelegate>) | viewDelegate |

Initial value:
{
NextResponderProvider _getNextResponder

Create a keyboard manager.

The |viewDelegate| is a weak reference, typically implemented by |FlutterViewController|.

Definition at line 116 of file FlutterKeyboardManager.mm.

116 :(nonnull id<FlutterKeyboardViewDelegate>)viewDelegate {
117 self = [super init];
118 if (self != nil) {
119 _processingEvent = FALSE;
120 _viewDelegate = viewDelegate;
121
122 FlutterMethodChannel* keyboardChannel =
123 [FlutterMethodChannel methodChannelWithName:@"flutter/keyboard"
124 binaryMessenger:[_viewDelegate getBinaryMessenger]
125 codec:[FlutterStandardMethodCodec sharedInstance]];
126
127 [keyboardChannel setMethodCallHandler:^(FlutterMethodCall* call, FlutterResult result) {
128 [self handleKeyboardMethodCall:call result:result];
129 }];
130
131 _primaryResponders = [[NSMutableArray alloc] init];
132
133 __weak __typeof__(self) weakSelf = self;
134 [self addPrimaryResponder:[[FlutterEmbedderKeyResponder alloc]
135 initWithSendEvent:^(const FlutterKeyEvent& event,
136 FlutterKeyEventCallback callback,
137 void* userData) {
138 __strong __typeof__(weakSelf) strongSelf = weakSelf;
139 [strongSelf.viewDelegate sendKeyEvent:event
140 callback:callback
141 userData:userData];
142 }]];
143
144 [self
145 addPrimaryResponder:[[FlutterChannelKeyResponder alloc]
146 initWithChannel:[FlutterBasicMessageChannel
147 messageChannelWithName:@"flutter/keyevent"
148 binaryMessenger:[_viewDelegate
149 getBinaryMessenger]
150 codec:[FlutterJSONMessageCodec
151 sharedInstance]]]];
152
153 _pendingEvents = [[NSMutableArray alloc] init];
154 _layoutMap = [NSMutableDictionary<NSNumber*, NSNumber*> dictionary];
155 [self buildLayout];
156 for (id<FlutterKeyPrimaryResponder> responder in _primaryResponders) {
157 responder.layoutMap = _layoutMap;
158 }
159
160 [_viewDelegate subscribeToKeyboardLayoutChange:^() {
161 [weakSelf buildLayout];
162 }];
163 }
164 return self;
165 }

References <FlutterKeyPrimaryResponder>::layoutMap, FlutterBasicMessageChannel::messageChannelWithName:binaryMessenger:codec:, FlutterMethodChannel::methodChannelWithName:binaryMessenger:codec:, FlutterMethodChannel::setMethodCallHandler:, and <FlutterMessageCodec>::sharedInstance.

## ◆ isDispatchingKeyEvent:

- (BOOL) isDispatchingKeyEvent: |  | (nonnull NSEvent *) | event |

Returns yes if is event currently being redispatched.

In some instances (i.e. emoji shortcut) the event may be redelivered by cocoa as key equivalent to FlutterTextInput, in which case it shouldn't be processed again.

## ◆ syncModifiersIfNeeded:timestamp:

- (void) syncModifiersIfNeeded: |  | (NSEventModifierFlags) | modifierFlags
timestamp: |  | (NSTimeInterval) | timestamp

Synthesize modifier keys events.

If needed, synthesize modifier keys up and down events by comparing their current pressing states with the given modifier flags.

Definition at line 344 of file FlutterKeyboardManager.mm.

344 :(NSEventModifierFlags)modifierFlags
345 timestamp:(NSTimeInterval)timestamp {
346 for (id<FlutterKeyPrimaryResponder> responder in _primaryResponders) {
347 [responder syncModifiersIfNeeded:modifierFlags timestamp:timestamp];
348 }
349 }

References <FlutterKeyPrimaryResponder>::syncModifiersIfNeeded:timestamp:.

The documentation for this class was generated from the following files:

- shell/platform/darwin/macos/framework/Source/FlutterKeyboardManager.h
- shell/platform/darwin/macos/framework/Source/FlutterKeyboardManager.mm

+[FlutterBasicMessageChannel messageChannelWithName:binaryMessenger:codec:]
instancetype messageChannelWithName:binaryMessenger:codec:(NSString *name,[binaryMessenger] NSObject< FlutterBinaryMessenger > *messenger,[codec] NSObject< FlutterMessageCodec > *codec)
Definition: FlutterChannels.mm:82
FlutterBasicMessageChannel
Definition: FlutterChannels.h:37
FlutterMethodChannel
Definition: FlutterChannels.h:220
-[FlutterEmbedderKeyResponder getPressedState]
nonnull NSDictionary * getPressedState()
Definition: FlutterEmbedderKeyResponder.mm:796
-[FlutterMethodChannel setMethodCallHandler:]
void setMethodCallHandler:(FlutterMethodCallHandler _Nullable handler)
FlutterChannelKeyResponder
Definition: FlutterChannelKeyResponder.h:17
+[FlutterMethodChannel methodChannelWithName:binaryMessenger:codec:]
instancetype methodChannelWithName:binaryMessenger:codec:(NSString *name,[binaryMessenger] NSObject< FlutterBinaryMessenger > *messenger,[codec] NSObject< FlutterMethodCodec > *codec)
FlutterEmbedderKeyResponder
Definition: FlutterEmbedderKeyResponder.h:20
FlutterStandardMethodCodec
Definition: FlutterCodecs.h:469
+[FlutterMessageCodec-p sharedInstance]
instancetype sharedInstance()
FlutterJSONMessageCodec
Definition: FlutterCodecs.h:81